Leaf Curl

Advice required please, as both money maker and sweet million tom varieties grown in separate greenhouses at the allotment are suffering from leaf curl.& slight discolouration to some of the leaves but no 'spots' as such. Leaf texure is slightly leathery too and general growth rate seems reduced despite the good weather. Red spider mite prevalent in one house but not the other and not on plants especially rather the staging etc. No other pests evident and as such, no pesticides applied. Same varieties being grown at home and no issues there. All help appreciated thank you

i don/t worry about leaf curl much. it occurs when plants are growing. i sugest feeding more.try two or even 3 times a week .it could be your compost is running out of nutriants. if leaves are yellowing put a teaspoon of epson salts sprinkled round base and water in. it could be lack of magnesium. good luck. let us know of progress.